Finding the Fourth Proportional to 1,442.48, 1,990.02 and 911.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.48 : 1,990.02 = 911.18 : x
2. Step 2: Convert to fraction form
   1,442.48/1,990.02 = 911.18/x
3. Step 3: Cross multiply
   1,442.48x = 1,990.02 × 911.18
4. Step 4: Simplify right side
   1,442.48x = 1,813,266.42
5. Step 5: Solve for x
   x = 1,813,266.42/1,442.48
6. Step 6: Final answer
   x = 1,257.05